Collapse Or Recovery: Pitt Island Vegetatioini 1980-1993, With
Collapse or recovery: Pitt Island vegetation 1980-1993, with reference to Chatham Island Geoff and Sue Department of Conservation, Napier 6 Fitzroy Road, Napier Published by Department of Conservation Head Office, PO Box 10-420, Wellington, New Zealand This report was commissioned by Canterbury Conservancy ISSN 1171-9834 1995 Department of Conservation, P.O. Box 10-420, Wellington, New Zealand Reference to material in this report should be cited thus: Walls, G., and Scheele, S., 1995. Collapse or recovery : Pitt Island vegetation 1980-1993, with reference to Chatham Island. Conservation Advisory Science Notes No. 120, Department of Conservation, Wellington. Keywords: Pitt Island, Chatham Island, regeneration, browsing, mammal control, vegetation, feral animals, ecosystem, monitoring, conservation, management Summary Concern about the loss of native forests and wildlife from Pitt Island led to the establishment of a system of protected areas there in the late 1970s. Sub- sequent conservation management of those areas has aimed to halt and re- verse that decline. The research reported on here has been designed to gain an understanding of the vegetation condition and trends and to assess whether the management was successful. Vegetation plots and photopoints were established and first surveyed in 1980, were resurveyed and expanded in coverage in 1987, and were reassessed and further extended in 1993. They show very clearly that forest health and sur- vival are profoundly dependent on conservation management - chiefly con- trol of domestic stock and feral mammals - and that the effectiveness of the management is patchy. Forest canopies are vulnerable to damage and death caused by storms, espe- cially on exposed sites, and if unprotected, forests quickly collapse and dis- appear - within a few decades.
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